Metal-grinding machine



J. G. HOBSON.

METAL GRINDING MACHINE.

APPLICATION FILED APR. 11. I919;

1,320,859. Patented Nov. 4, 1919.

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JAY G. HOBSONQ QF MARTIN'SVILLE, INDIANA.

METAL-GRINDING MACHINE.

Specification of Letters Patent.

Patented Nov. 4, 1919.

Application filed April 11, 1919. Serial No. 289,217.

To all whom it may concern:

Be it known that I, JAY G. Honson, a citizen of the United States, and aresident of Martinsville, in the county of Morgan and State of Indiana,have invented new and useful Improvements in Metal-Grinding Machines, ofwhich the following is a specification.

This invention relates to metal grinding machines and has particularreference to that class of machines employed as a means for sharpeningor repointing phonograph needles.

An important object of the invention is to provide in a device of theabove mentioned character a means whereby a plurality of needles may besharpened or repointed simultaneously.

A further object of the invention is to provide in a device of the abovementioned character a means whereby the needles are rotated about theiraxis and moved in acircular path during the sharpening or re pointingoperation. I

A further object of the invention is to provide in a device of the abovementioned character a means whereby the needles may be inserted into themachine so that their points will lie in a common horizontal plane toeffect a uniform and evengrinding upon the ends thereof.

A further object of the invention is to provide in a'device of the abovementioned character a means whereby the abrasive ma terial may be movedinto contact with the points of the needles and retained in contacttherewith during the sharpening or repointing operation.

A further object of the invention is to provide a device of the abovementioned character which is simple in construction, compact, durableandreliable in operation.

Other objects and advantages of the invention will be apparent duringthe course of the fOllOWing description taken in connec tion with theaccompanying drawings.-

In the drawings, forming a part of this specification and in which likeparts are employed to designate like parts throughout the same, I

Figure 1 is a top plan view of the device embodying my invention,

Fig. 2 is a vertical sectional view taken on line 22 of Fig. 1,

Fig. 3 is a fragmental sectional viewsimilar to that shown in Fig. 2,the abrasive material being shown in a lowered position,

Fig. 4 is a detailed horizontal sectional View taken on line 44 of Fig.3, and,

Fig. 5 is a top plan view of a needle carrying element.

In the drawings, wherein for the purpose of illustration is shown apreferred form of my invention, the numeral 5 inclicates a base having ahousing 6, the base together with the housing 6 forming a containerwithin which the several cooperating elements hereinafter described arearranged. To. the base 5 there is centrally secured a verticallydisposed post 7, the post being square in cross section and secured inposition by means of a screw or the like as shown at 8.

Within the lower portion of the post 7 there is journaled a horizontallydisposed shaft 9. The shaft 9 is further journaled within the housing 6as shown at 10 and is prevented from moving longitudinally by means ofpins passed transversely through the shaft as shown at 11. The shaft 9is bent at one end to form a substantially L- shaped portion as shown at12 and is provided at its other end with an operating lever 13. Theshaft 9 is bent substantially intermediate its ends to provide aU-shaped portion 14. Upon the square post 7 there is slidably mounted adisk 15 adapted to be raised and lowered through the instrumentality ofthe operating lever 13 as will hereinafter be more fully described. Thedisk 15 is prevented from rotating, due to the fact that the centralopening thereof is square and is only sufficiently larger than thesquare post 7 to permit free vertical movement of the disk 15. The disk15 is provided at its periphery with an angularly disposed dependentflange 16 having its outer face provided: with suitable abrasivematerial or coating as shown at 17.

The post 7 at its upper end is reduced to provide a stub shaft 17 uponwhich is journaled a relatively large gear 18 having peripheral flanges19 between which the gear teeth 20 are disposed. The gear 18 is retainedin position upon the shaft-17 by 'means of a nut2l having screw-threadedengagement with the shaft 17 as shown at 22. As a means for rotating thegear 18 there is provided a vertically disposed handle 23 which issecured to the gear 8 an appreciable distance from the axis of the shaft17.

The housing 6 at its upper inner edge is depressed or cut away as shownat 2 1 to pro vide an internal gear 25 which meshes with a plurality ofpinions 26. The pinions 26 are spaced an appreciable distance from eachother and mesh with the teeth 20 of the gear 18. It is apparent from thestructure thus far described that by rotating the gear 18 the pinions 26are not only rotated about their known axis but are moved in a circularpath about the axis of the shaft 17. Upon the housing 6 there isdisposed an annular ring 27 which is retained in position by means ofscrews or the like as shown at 28. The ring 27 and the flanges 19, as isapparent, serves as a means for retaining the' pinions 26 in theirrespective positions as shown in Fig. 2. The pinions 26 are providedcentrally with preferably rubber hubs 29 having openings 30 therein,which openings are adapted to receive-the phonograph needles 31 whichare desired to be sharpened or repointed.

In order to limit the downward movement of the needles 31 when beinginserted so that the points of the needles will all lie in a commonhorizontal plane I provide a reciprocating plunger 32, square in crosssection to prevent turning within the housing 6. The plunger 32 isprovided with a head 33 adapted to receive thereupon the points of theneedles 31 when being inserted. The plunger 32 is provided at its outerend with a push button 34. Between the push button and the housing 6there is disposed a suitable coil spring 35 which is adapted to normallyretain the plunger 32 in a retracted position as clearly shown in Fig.2.

In use, the device as a whole may be conveniently located to thephonograph and as the needles are used and consequently dulled they areinserted into the openings 30 of the hubs 29. Each time that a needle isinserted the plunger 32 is moved to the position shown in Fig. 3 so thatwhen the machine is filled to its capacity all of the points of theneedles will lie in a common horizontal.

plane to insure even and uniform grinding thereof. It is to beunderstood that the needles are inserted in the desired hub when thathub is directly above the head 33. The selected hub may be brought intoregistration with the head 33 by simply rotating the gear 18 as isapparent. WVhen a desired number of needles have been placed in themachine, it need not be filled to its capacity however, the lever 13 ismoved to partially rotate the shaft 9 whereuponthe disk 15 is movedupwardly due to the engagement of the bent portions 12 and 14 therewith.The gear 18 is then rotated by means of the handle 23 whereupon theneedles 31 having their pointed ends engaging the abrasive material orcoating. 17 are rotated about their axis and moved bodily in a circularpath about the axis of the stub shaft 17. By retaining the engagementbetween the pointed ends of the needles 31 and the abrasive material orcoating 17 and continuing to rotate the gear 18, a uniform sharpening orrepointing of the needles 31 may be effected. I/Vhen the needles havebeen sufiiciently sharpened or suflieiently repointed, rotation of thegear 18 is discontinued and the disk 15 is loweredto its normal positionwhereupon the needles 31 may be easily withdrawn from the openings 30 ofthe hubs 29. It is to be understood that the plunger 32 is to be allowedto retain its normal position as shown-in Fig. 2under the influence ofthe spring 35 at all times other than when the needles are beinginserted as hereinbefore described. Because of the peculiar constructionand location of the plunger and head 33 there is no interference set upto hinder the sharpening or repointing opera tion when the plunger isallowed to remain in its normal position under the influence of thespring 35 as clearly shown in Fig. 2.

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a preferred example of the same, andthatvarious changes in theshape, size and arrangement of parts may beresorted to without departing from the spirit of the invention or thescope of the subjoined claims.

Having thus described my invention, what I claim as new and desire tosecure and protect by Letters Patent of the United States, is: I

1. A phonograph needle sharpener comprising an external gear and aninternal gear, a plurality of pinions engaging said gears, means forrotating the external gear to rotatesaid pinions about their axis andmove themin a. circular path, means for retaining the phonograph needlescentrally within said pinions, and abrasive material for engaging thepoints of the needles during their rota-tion.

2. A phonograph needle sharpener C0111- prising an external gear and aninternal gear, a plurality of pinions engaging said gears, means forrotating the external gear to rotate said pinions about their axis andmove them in a circular path,.means for retaining the phonograph needlescentrally within said pinions, abrasive material for engaging thepointsof the needles during theirrotation, and means for moving theabrasive material into and out of engagement with the points of theneedles.

3. A phonograph needle sharpener comprising an external gearand aninternal gear, a plurality of pinions engaging said gears, means forrotating the external gear to rotate said pinions about their axis andmove them in a circular path, means for retaining the phonograph needlescentrally within said pinions, abrasive material for engaging the pointsof the needles during their rotation, means for moving the abrasivematerial into and out of engagement with the points of the needles, andmeans for bringing the points of the needles into a common plane.

l. A phonograph needle sharpener comprising an external gear and aninternal gear, a plurality of pinions spaced from each other and havingengagement with said gears, means for rotating the external gear wherebysaid pinions are rotated about their axis and moved in a circular path,means for I retaining the phonograph needles centrally within saidpinions, a reciprocating disk, abrasive material secured to said disk,and means for reciprocating said disk whereby th abrasive material ismoved into and out of engagement with the points of the needles.

5. A phonograph needle sharpener comprising a pinion, means, forretaining a phonograph needle centrally within said pinion, an abrasivematerial for engaging the point of the needle, and means for rotatingsaid pinion about its axis and for simultaneously moving said pinionbodily in a given path during the engagement of said abrasive materialwith the point of said needle.

6. A phonograph needle sharpener comprising a pair of gears, a piniondisposed between and engaging said gears, means for moving one of saidgears to rotate said pinion about its axis and move said pinion bod ilyin a given path, means for retaining a phonograph needile centrallywithin said pinion, and abrasive material for engaging the point of theneedle when the pinion is rotated and moved bodily.

7 A phonograph needle sharpener comprising a stationary element, amovable element, a pinion interposed between said stationary and movableelements, said pinion having engagement with said stationary and movableelements, means for moving the movable element to rotate said pinionabout its axis and move said pinion bodily in a given path, means forretaining a phonograph needle centrally within said pinion, and abrasivematerial for engaging the point of the needle during its rotative andbodily movement.

JAY Gr. HOBSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

